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Brett is correct about the coatings - they use a proprietary vixen coating. I own a VC200L which had its mirrors recoated locally by the previous owner. It gave awful images after that. It was later sent back to Vixen and now works fine in its new CF truss configuration.
If you remove the primary mirror, put a reference mark on its edge so you can relocate it. Also, do not tighten the rubber mirror clips too much. They really just need to be resting against the mirror, not pressing down - undue pressure can induce aberrations on this quite thin mirror.
It is also a good idea to centre spot the secondary mirror witth a fine felt tip pen - this will make collamation with tools or a laser much easier. You can make a spot template quite easily by pasting a series of ever reducing concentric circles in a graphics package - merely cut the paper circle to the secondary size and pierce the middle with a pin - you can then place the paper over the mirror and poke the fine felt tip through the hole.
guy
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